Oh, man... I wish the original designers of the Alpha Mysh worked on a larger version, optical USB cordless etc... This mouse seems to be originally designed by Allspirit as a "Kiddy Mouse" and they are not aware of it's potential (I've even emailed them). It was also marketed by Guillemot in Europe. I have one of those and it's a very good design, only too small since it was designed for kids. Thumb button is a middle button. It's almost not sold in the US (I've just ordered a flashing lights version cause everything else is sold out).
http://www.allspirit.com.tw/list.htmhttp://www.allspirit.com.tw/list.htm
By the way, considering the stuff BossWave writes about joystick control (vector +) - has anyone tried using joystick as a mouse? I've tried half a dozen programs for this and it sems like it's not very functional. Actually that BossWave page was pretty interesting. I guess a joystick with improved aiming (switch from vector to coordinate on the fly) would be a very ergonomic pointing device. I've seen joystick to mouse apps that have an absolute coordinates option. You just need to add an interactive switch from one to another. Sorry I'm rambling.